Automatic stop for sound-reproduction apparatus



Sept; 18, 1923.

F. c. HOBBS AUTOMATIC STOP FOR SOUND REPRODUCTION APPARATUS 4 Sheets-Sheet '1 v Filed D60. 23

I 3440mm flC.H0JZs.

q ilttomxmas Sept. 18, 1923. 5 1,468,295.

F. C. HOBBS AUTOMATIC STOP FOR SOUND REPRODUCTION APPARATUS Filed Dec. 25. 1921 4 Sheets-Sheet 2 Illllll u l munl llllllllllllllllllllll||l ammo r I Sept. 18,1923.

" v v F. c. HOBBS AUTOMATIC STOP FOR SOUND REPRODUCTION APPARATUS Filed Dec. 25. 1921 4 Sheets-Sheet 5 52M aw Sept.

F. 0. H0555 AUTOMATIC STOP FOR SOUND REPRODUCTION APPARATUS Filed Dec; 25. 1921 4 Sheets-Sheet 4 V for trating the carrier plate, brake lever, cletentl Patented Sept 18; 192 3.

FRANK or Hoses, oiafstri iuina' initial 1 :11

A pl cation filedrbeceniber23;1921.-.SerialEl'oJ524E5b6i To (all w/lom it may concern i 7 Be it known that l, FRANK C. Hoses, .a

citizen of the United; States; residing at- Bufi'alo, in the county of Erie and State of New York, have invented certain new and useful Improvements in Automatic *Stops soundsReproduction Apparatus,- which they following is a specification.

This invention relates to improvements in 1 automatic stops for sound reproduction a'pparatus.

One of the objects of the present invention is. to provide a stop which willrequire no,

attention in setting it for operation but usualfmanner after the record has been placed upon the record'supporting turntable. 7 7

Another object of the invention isto pro-. vide an automatic stop which will operate automatically to arrestthe motion of the turntable when the inner end of the record groove has been reached by the stylus ot' the reproducer regardless of the length of the record so that it is unnecessary to inaltejadjustinents to compensate for variations in the lengths'of records being reproduced.

Another object of the invention is to provide an automatic stop for sound reproduc- 5 tion apparatus which will be positive in its action, simple'in construction, and not liable to disarrangeinent of its parts.

In the accompanying drawings: 'Figure 1 is a plan view of the stop mechanism embodying the invention; 7

Figure 2 isa verticalsectional view in de-v tail taken substantially on the line 0t Figure 1 looking in the direction indicated by the arrows; V

Figure 3 is a side elevation ofthe mechanism; s

Figure l is a group perspective view illus and associated parts of the mechanism;

Figure 5 is a perspective view of'the sup porting base plate of the mechanism: I

Figure 6 is a perspective View illustrating the setting lever and the trip finger which carried by the tone awn of the apparatus];

Figure 7 is a transverse scctionalview on the line 7 7 or" Figure 1 looking in the direction'indicated by the arrows:

cated by the arrows; V I 5 view through'one endott'the' detent. p

."Inthe drawingsthe numeral l -indi'cates in. general the record supporting turntable lot- Figure 9 is 'a' detailttansverseegsectional theapparatus which is driven by any suite;

able type of motor throughlthemedium of the usual spindleindicatedlbythe numeral 2.

The tonearin is indicated by'the numeral and is ofthe ordinary construction and sup-J ports the re'produceit 4 and its neckowhich is swiveled to the tone arm III the usual manner. .The'turn tablel is provided withthe j usual flange 6 at its periphery against which flange braking action. is to be. exerted when which will be automatically set upon inovement ofthe tone arm in substantially the theapparatus is notji n fiCilHEllIOPQTZLtlOIl. The mechanism embody ng the invention is supported practically in its entirety upon-a supporting base platewhich is best shown in Figure'Softhe' drawings and which is'indicated in eneral-b the numeral .7. The

base plate 7 isofjfi'ame-likestructureand is secured'uponthe top board of the cabinet of and 9 which constitute guidesand tracks for supporting andguiding thecarrie'r plate of the mechanism,- and thesaid base plate is also provided with an upstandingflange 10 which serves similanpurp'ose, the flanges 8, 9 and 10 being arcuate and concentricwith relation to; one another; The lba'se plate" is j I -also. formed Withfla supporting-flange 11 and a supportingand guiding flange 12 for the setting lever of the mechanism; the latter flange being provided with a slot'l3. The

base plate is also formed with upstanding guiding andsupport ng flanges 14 and 15 for the; brake lever, the latter flange being Y provided withaslot 16 the purposevof which will presently beexplained. The carrier plate heretofore referred to is e indicated in general by the numeral 17 and the said plate is 'disposed upon 't-he upper edges of the flanges"8,' 9 and 10 and thus; supported forflsh fting movement above the base plate 7'. :In order to guide the plate 17, it is providedupon itsunder side with,

pairs of rollers lS 'and '19 .wh ich vits best shown in {Figure 2, travel respectively against. the nner-sides of the flanges 8 and 9.5111 order to restrain thefcarrier plateylT gainstupward -displacement,the said plate Figure 8 is a similar view on the-line'8-"S,

lSQJXTOYldGClQb what maybe termed its'inner end/as it is the end which ,is located nearer :the center about whichthe flanges, 8 ,19 and;

are concentric, with a lip whieh projects beneath -a-guide 21 secured-at its ends upon the upper side of the base plate 7 and having its intermediate portions spaced from said platqthis construction being clearly shown in Figure 2 of the drawings.

The brake lever of themechanlsm 1s indicated in general by the numeral 22 and thesame is pivotally supported at one end as at 23 upon the base plate 7, the said lever being formed near its other end with a longitudinally extending slot 2s, Near its pivotedend the brake'lever is provided withan upstanding efian1p25'support1ng a brake shoe braking engagement with said flange when the brake lever 22 is swung in one direction i upon its pivot 23' andto be moved out of engagement with the flange when the lever is swung in the opposite direction. The slotted end of the brake lever 22 projects over an extension 27 at the outer end of the carrier plate 17 and in order to efieet movement of the brake lever into and out of braking positions, athrust link 28 is provided and is slidably mounted'upon the extension 27 of the carrier plate 17. "This thrust link I is provided at its outer end with a stud29 which works in the slot 24 in the brake lever 22 and at its inner end 18 provided upon its under side with a boss 30 which rests slidably upon the upper side of the extension 27 of the said carrier plate; The carrier plate is provided along one longitudinal edge at that side at which the extension 27 is located,

with an upstanding flange 31 which serves a purpose to be; presently pointed out and which is formed with a longitudinal slot 32 slidably receiving a lug which projects from one end ofthe boss 30 and which is notched as indicated by the numeral 341. A tension spring 35 is engaged at one'end in the notch of the lug 33 and at its'other end is engaged with a lug 36 which projects laterally from the outer end of the flange 31 of the carrier plate; that the spring 35 normally tends to exert a pull upon the thrust link 28 to shift the same outwardly longitudinally upon the ex tension 27 of the carrier plate and that when such movement of the link 28 is permitted, the brake lever 22 will be swung upon its pivot 23 to bring thebrake shoe 26 into engagement with the braking flange of the record supporting turntable. Movement of the thrust link 28 inthe opposite direction and against the tensionof the-spring 35 will serve of course to so swing the lever 22 upon its'pivot as to move the brake shoe26 out of braking engagement with the flange 6 thus releasing the turntable for rotation through the medium or" its driving motor.

It will now be evident leveri22 beheld in inactive position while the record is being reproduced, and with this end in view there is provided, in connection with the thrust 'linkl28, a detent which is It is of course essential that the brake indicated in general by the numeral 37. Thedetent 37' is pivotally mounted bymeans of a pivot screw 38 upon the under side of the extension 27 of the carrier plate 17 and the said detent is provided atone end with a fshoulder'39which is adapted to engage and eoact with the flattened side iO of a stud 41 I e which is fixed at the inner end of the thrust 1 link 28 adjacent to the boss 30, the stud 41' projecting downwardly from the link 28 and working through a slot 12 formed in the extension 27 ofthe carrier plate 17. It will now be evident that when the brake lever 22 is in inactive position, the thrust link-28 tent 37 will engage behind the flattened side f the stud 41 as shown in Figure 2 of the drawings thus holding the link 28 shifted inwardly and maintaining the brake lever 22 in inactive position} However with the parts in this position the spring 35 will vbe under tension and will therefore be evident that when the detent 37 is swung upon its pivot,the shoulder 39 will be brought,

out of engagement with the flattened side 40 of the stud 41 and the link 28 will be released i'or shifting movement under the in-. V

fluence of the spring to thus move the brake lever 22 to active position. The detent 37 is normally held in position for the coactionfi of its shoulder with the stud 4:1 by means of a spring 43 coiled at an'intermediate point about the pivot pin 38 and anchored at one end as at 44 in the extension 27 of the car-- rier plate 17, the other end of the spring engaging in-a groove 45 formed inthe edgeof the detent 37 at that end atwhir-h the shoulder 39 is located. By reference'toFigure-2- of the drawings it will be observed that the detent 37' is mounted upon the under side of the extension 27 and that the lower end of the stud il projectsbelow the'plane of the under side of the said extension 27 in posi}v tion for engagement by the shoulder 39.

Movement of the thrust link 28 inwardly to move the brake lever 22 to inactive posi-jy tion is effected through the medium 02 a set-' ting lever which is indieated in general by the numeral 16 The setting lever -16 is pivotally mounted as at 17, between its ends, upon a raised portion 18 ot' the base' plate 7 and at one end the lever is supported upon the flange 11 and at its other end it works through the slot 13 in the flange 12. Thelast mentioned end of the leve r is provided with a fingered) which projects between the extens1on'27 of the earrierpiate 17 and the thrust link 28 and, when the lever is rocked in one direction, engages the lower end portion of the studaland moves the thrust linlr longitudinally inwardly until the-stud engages behind the shoulder 39'ot the detent 37. This movementot the lever'4c6 isettected through the medium of a trip arm w hich is carried by the tone armof the apparatus and whichis indicated in general by the numeral 50. The arm '50 is provided with a:

rounded outer engaging end. 51 designed to ride against a cam projection 52 upon that end of the setting lever a6'opposite the end which carriesthe finger 49, the arm '50 moving in an arc wit-h the tone arm, and the cam projection 52 being located'inthe pathof movement of the outer end 51 of thesaid arm 50.- f 1 Thetrip arm is provided near itsinner end with an upturned portion 53 which. is, secured in any suitable manner as at 54 -to theunder side of the tone arm 3, the. said portion 53 being preferably provided wit lia lateral extension projecting beyond the tone arm and indicated by the numeral 55 to afford a support for the reproduce'r when the reproducer is swung back to inactive posi-- tion. For a purpose to be presently explained the trip arm 50 is formed with a slot 56 locat= ed near its outer engaging end 51, and itis also formed upon its underside, inwardlyof the slot 56, withalug In the inward swinging movement of the tone arm 3, the

corresponding movement of the trip arm 50' to the under side of the carrier plate 17:

and provided at its free end with an upstanding latch head 62 which projects through the slot 58 and engages in the slot 56 in the trip arm 50 thus locking the trip arnr with relation to the carrier plate 17 so that,

these parts will move in unison. It will now be evident that when the tone arm is moved inwardly, the edge of the trip arm 50 will be brought into engagement with the flange 31 of the carrier plate 17 and as the arm 3 continues to move inwardly, the carrier plate will be correspondingly moved. Inasmuch as in this position-of the partsthe latch head "2 will lock together the trip armand carrier plate, it is evident that the outward swinging movement of the tone arm will-effect a corresponding movement of the carrier plate and the return of the latter to, its normal position of shifting movement; However it is necessary that theparts he at the same time, by loosening 7 66, the finger may be adjustedin th direc 1V tween the fiange'sf 8 and -9 and ,has its ifreearin 50 in bringing the carrier disengaged an other words that therap arm be released from engagementiwithjtlie' reached the limit ofits movement to normal position, and the means employed for this carrier plate l7, when the carrier plate has."

purpose comprises a finger 63 provided near one end with a slot 64 receivmg an upstandscrew 66 which is threaded intosaid plate. The engagement of the stud and set screw through the slot 64 serves to prevent any pivotal"displacement of the finger 63 and tion of its length. The finger projects he the set screw' 'ing stud 65 upon the base plate '7. and a set V endportio'ndeflected in an upward direction 7 as indicated by the-numeral67and gradu ally-thinned to a: relatively sharp extremity. Thef portion-68 lot the finger rests againstfinger is-located in the the latch 59 so that swung outwardly, and the carrier plate is shiftedina correspondin direction, the parts being at such time locked together by path of movement of the latch head- 62, the stem 60 of the latch. 59- will ride against andbeneath the err-- tremity 68 of the finger 63, and the latch its head. 62 from the slots 56 and 58,-t-husreleasingthe trip arm and permitting conwhen the tone arm is.

59 will be sprung downwardly to disengage i the under side of the carrier plate lr' and the" tinned movement of the same in'unison with i the tone arn'iwhile the carrier plate remains stationary 1n the position to which it hasbeenmovec. In order' to assist the trip plate back to its normal position, a spr ing'69 lS' COlk-KI T between-its ends as at 70 and-secured to the underside of the carrier plate andhas'its end portions extending in opposite directies as at 71- forengagementagainst theends of the 'fianges'S and 9. It will be evident that when the carrier plate is'moved through .tions an'd-slightly bowed at'their extremilie the medium of the trip arm, the intermediate portionJofthe spring 69 will be drawn withit and the ends 71 of the spring willride-in engagement with the said ends of the flanges, the spring being relieved to a defgree, of its tension when the carrier plate has reached its normal position, and serv-" ing also-as a means for retaining the plate in this position until'it is again engaged by thetriparm. I 1

In order to steady the carrier platel? and to acertain extent talre'up the longitudinalthrust of said plate, the plate-is preferably formed near its innerend with a recess 72 to receive the lug 57 upon the trip arm 50.

The mechanism further embodies a worm shaft which is indicated in general by thenumeral. 72 able bearings 73 provided plate 7. A worm pinion 74c is fiXed or and which is mounted in suit-;

upon the base formed upon this shaft, andnieshes with a 'l worm gear i rotatable with the supporting spindle 2 torthe record supporting turntable. The threads of the worm shaft 72 5 are indicated by the numeral '76, and the det nt 37 supports its out-er end anu 7'7- l'or co-action with the threads 76 of the 'worm shaft. The nut '77 comprises a rocker 7S pivotally mounted intermediate it; ends upon the upper side of the said detent 37, and this rocker is provided at one end with a head 79. the engaging taee oi which is formed to mesh with the threads '76. A roller 80 is mounted upon the other end of the rocker "I8 and is designed to coact with the brake lever under conditions which will presently be pxplained, a Slheing I in engaget the if: iringg is provided with a rest 82 tor the head of the nut 77.

In Figure l of the drawings 'le parts are illustrated in the positions'which they will occupy while the rero is being reproduced o be moved in provided for holdin 'the nut 4 "except that the tone :1, in is t he reproducer r cord placed in the outer end of? th usual way, the edge oi the tip arm will t wit: the T and this the finger 63 allowing the latch hev be; projected upwardly through the slots 58 and 56 thus connecting together the trip arm and carrier plate for movement in unison. The movement of the carrier plate effects a disengagement ot the head 79 ot the nut '77 from the rest 82" so that the spring 81 will move the said head '79 into mesh .1'

with the worm 76 which is continuously ro tating. The carrier plate will continue to move in unison with the tone arm and trip arm until the stylus of the reproducer reaches the inner end oi the record groove whereupon the tone arm will cease to move inwardly. but as the worm shaft 72 is rotat- 50 ing and the nut zi' is in mesh therewith, the

nut will be ted inwardly with the result that the detent 37 upon which it is carried will be rocked upon its pivot to disengage the shoulder 39 from the stud all thus releas of the worm shaft.

n arfllv in the the head .79 ot the nut from the threads 76 mechanism for the playing of another record, it, is only necessary to swing the tone arm 3 in an coutward direction whereupon the engaging end of the trip arm 50 will ride againstthe cam portion52 0t thesaid setting lever 41G causing the-lever to rock upon its pivot and bring the finger 49 thereo-il into engagement with the stud 4:1 and thus shift the thrustlink 28 longitudinally In order to reset the.

inwardly against the tension ofthe spring 35 until the stud rises past and-engages behind the shoulder 89 of the detent 37 thus the brake lever 22 will be moved to inactive position and the turntable will be released for resumption of itsrotation. Of course 7 when the tone arm'fi is. initially swung outwardly, t-he carrier platel'? will be carried with it-and the platewill be restored toits normal position as: shown in Figure l. Howeveras the carrier plate assumes this position, the extremity 68 of the finger 63 will engage with the latch 59 in a manner to spring the latch downwardly and withdraw disconnected from the carrier plate and the tone arm may be swung further in an outwardly direction without effecting any furs ther movement of the'carricr plate.

:itshead 62 from engagement in the slot 56 in the trip armso: that the arm will then he,

Having thus described the invention what i claimed as'new is:

In sound reproduction ap1 araiius i-neluding a record supporting turntable and a .tone arm, means for automatically arr-ostmg the movement of the turntable upon completion of the- PQIlOd'Oli reproduction comprising a brake member, a carrier mov-;

able through movement of the tone armdur ng the carried by the carrier'and coacting with the brake member tending to move the brake member to active position, a detent upon the carrier for restraining the last men-' tioned means when the latter is moved to inactive position, means operable through manual movement of the tone arm, to move the said last mentioned means to inactive position and thereby render the brake in:- Wil /'8, and means operable through rotation of the turntable to effect movement of: the

'detent to inactive position upon cessation of movement of the tone arm and carrier.

2 111 SOUIICl'IGPYOdUCtIOH apparatus 1ncluding a record supporting turntable and a tone arm, means for automatically arrestinnthe movement of the turntable upon completion of the period of reproduction comprising a brake member, a carrier movable with, the tone arm during the period of reproduction,a thrust member upon the, carrier operatively connected. with the brake member, means tending to move the thrust reproduction period, means.

' turntable subsequent to cessation of movement of the tone arm and carrier to render the detent inactive.

V 3. In sound reproduction apparatus including a record supporting turntable and atone arm, means for automatically arrest-i ing the movement of the turntable upon completion of the period of reproduction comprising a brake member, a carr er movable with the tone arm during theiperiod of reproduction, a' thrust member upon the carrier operatively connected with the brake member, means tending to move the thrust member in a. direction to render the brake member active, a detent upon the carrier for coaction with the thrust member to restrain the same in inactive position, means for moving the thrust member to inactive position and for engagement by the detent,

and means actuated through rotation of the turntable subsequent to cessation of move ment of the tone arm and carrier to render the detent inactive, the said means comprising a worm shaft rotated in consonance with the turntable, and an element upon the detent for coaction with the worm of the shaft.

4. In sound reproduction apparatus including a record supporting turntable and, a. tone arm, means for automatically arresting the movement of the turntable upon completion of the period of reproduction comprise ing a brake member, a carrier movable with the tone arm during the period of reproduc tion, a thrust member upon the carrier operatively connected with the brake member, means tending to actuate the thrust member to move the brake member to active position, means for moving the thrust member to in active position, a detent upon the carrier for restraining the thrust member in inactive position, and means for rendering the detent inactive upon cessation of movement of the tone arm comprising a worm shaft rotated in consonance with the turntable, a rocker upon the detent having means for operative engagement with the worm of the shaft, means tending to move the rocker to bring its said means into coactive relation to the 5. In sound reproduction apparatusfincludlng a record supporting turntable and a tone arm, means for automatically arrest-' ing the movement of the turntable'upon completion of the period of reproduction comprising a. brake member, acarrier movable with the tone arm during the period of reproduction, a thrust memberuponthe can rier operativ-ely' connected with the brake member, means tendingto actuate the thrust .70 5, -member to move the brake member'to active g POSltlOIn HlGiLIlS for'moving the thrust mem her to inactive position, a detent uponthe carrier forrestraining the thrust member in inactive pos1t10n,,and meansfor rendering the detent inactive upon cessation of.

movement of'the" tone arm comprisinga' worm shaft rotated consonan'ce with the turntable, a rocker-"upon the detent'having means for operative engagement with the worm of the shaft, means tending to'move the rocker to bring. itsfsaid means into coactive relation to the said worm, and-means upon the rocker engageable 'by the brake member upon movement of the brake momher to active position to disengage the rocker from the worm.

6. In sound reproduction apparatus ineluding a record supporting turntable and a tone arm, means for automatically arrestingthe movement of the turntable upon comple tion of the period of reproduction compris-- ing a brake member, a' carrier movable with the tone arm during the period of reproduction, a thrust member upon the carrier operatively connected with the brake member, means tending to actuate the thrust member to move the brake member to active position,

the said carrier having a slot, a stud upon the thrust member projecting through said slot, a detent pivotally supported upon the carrier for restraining the thrust member in inactive position by coaction with the said stud, means actuated throughmanual movement of the tone arm to engage with the stud and shift the thrust member to inactive position, and means'actuated through rotation of the turntable subsequent to cessation of movement of the tone arm to render the de tent inactive.

7. In sound reproduction apparatus in mounted upon the carrier and operatively connected with the brake member, means tending to shift the thrust member in one direction to'render the brake member active, a setting lever mounted for rocking movement and having means for coaction with an element of the thrust member to shift the thrust member .in the opposite, direction when the setting lever is rockedin one directionj coacting means upon the tone arm and setting leverfor eitectingisuch move-' ment for the setting; lever when the tone arm is manually-moved, a detent for restraining the thrust member when moved to position to renderthe brake member inactive, and means automatically operable to render the detent inactive upon cessation of movement of the tone arm.

8. In sound reproduction apparatus including a record supporting turntable and a tone arm, means for automatically arresting the movement of the turntable upon comple tion of the period of reproduction comprising a brake member, a carrier comprising a movably supported plate having an abutment means upon the tone arm positioned for engagement with said abutment when the tone arm is moved in one direction dur ing the period of reproduction, means for automatically coupling the means upon the tone arm and the said carrier whereby the rier has reached its normal position in its movement in the last mentioned direction,

means upon the carrier operatively con nected with the brake member and tending to move the brake member to active position, a detent for holding the. brake-member-moving means in inactive position; and means for automatically rendering the said detent inactive upon ccssationof movementof the tone arm at the completion of the period of reproduction.

In testimony whereof I afiix my signature.

FRANK o. HOBBS. a 8. 

